$def with (greeting)

$if greeting:
    <h2>
        I just wanted to say <em class="text-success">$greeting</em>.
    </h2>
$else:
    <p>
        <em>Hello</em>, world!
    </p>

<p>
<button type="button" class="pure-button pure-button-primary" onclick="window.open('/')">home</button>
</p>
